What i now what to do is the following: I will islote the terms "PB123" and
"PB456" and so on in the hole document. Therefore i need a spezial pattern i
think. The pattern is always the same: "PB" and then 3 or 4 numbers. I will
write this terms in an extra column in a HTML table.

How i get the text from <comment>...</comment> is clear for me. Thats no
problem.